body {
    margin: 0;
    padding: 0;
}

header {
    width: 100%;
    height: 400px;
    margin: 0 auto;
    background: url(../images/index/header.jpg) no-repeat;
    background-size: cover;
}

h1 {
    float: left;
    line-height: 0px;
    font-size: 40px;
    font-family: 微软雅黑;
    /* font-weight: lighter; */
    color: snow;
    line-height: 50px;
}

.nav {
    width: 100%;
    height: 50px;
    border-collapse: collapse;
    line-height: 50px;
    border-bottom: 1px solid gray;
    background: rgba(204, 117, 30, 0.4);
}

.nav a {
    float: right;
    height: 50px;
    right: 10px;
    background: rgba(204, 117, 30, 0.4);
    font-size: 18px;
    color: #fff;
    text-decoration: none;
    /* display: inline-block; */
    padding: 0 18px;
}

.nav a:nth-child(1) {
    margin-left: 52.5%;
}